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Cast pipe coating plug

A technology of lining and plugging, applied in the direction of pipes/pipe joints/fittings, coatings, pipe components, etc., which can solve the problems of scrapped plugs and uneven stress.

Inactive Publication Date: 2011-08-24
高平市泫氏铸管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently used plug is shown in Figure 1. The cross-sectional shape of its internal cavity is square. During the inflation process, due to the uneven stress on the inner wall and four corners, it is easy to cause the plug to be scrapped due to rupture. To reduce the The waste caused by the plug breakage saves costs, and the plug needs to be improved

Method used

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  • Cast pipe coating plug
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Experimental program
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Embodiment Construction

[0019] Cast pipe lining plug of the present invention is shown in Figure 2, and it comprises main body 3, and main body is made of elastic material, preferably rubber material; Gas in order to expand the plug; and an inflation nozzle 2, used to inflate the cavity 1, the edge of the cross-sectional shape of the cavity 1 is smooth, so that the inner wall of the cavity 1 is evenly stressed and difficult to break.

[0020] The cross-sectional shape of the cavity 1 can be selected to be circular or elliptical according to the thickness of the main body part 3 .

[0021] In order to save manufacturing cost under the premise of ensuring the sealing performance and make the plug more elastic after inflated, the main part 3 of the plug can be designed to be composed of a thicker peripheral part 4 and a thinner middle part 5 , the cavity 1 is located in the peripheral portion 5 .

[0022] The cavity 1 may be in the shape of a ring.

[0023] The invention changes the angular square cav...

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PUM

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Abstract

The invention relates to a plug used for stemming two ends of a centrifugation nodular cast iron pipe amid the cement coating of the nodular cast iron pipe. Provided is a cast pipe coating plug comprising: a main body made of elastomeric material, a cavity inside the main body and capable of being inflated for expanding the plug, and an inflation connector for inflating the cavity. The cast pipe coating plug of the invention is characterized by the round and smooth edge of the cross section shape of the cavity. According to the invention, the square cavity in the cast pipe coating plug, which has edge angles, is changed into the cavity with round and smooth cross section shape, therefore, the cast pipe coating plug can avoid rupture caused by stress concentration and accordingly realizes the objective of saving production cost.

Description

technical field [0001] The invention relates to a lining process of a centrifugal ductile iron pipe, in particular to a plug used for blocking both ends of the centrifugal ductile iron pipe during the cement lining process. Background technique [0002] In the production process of centrifugal ductile iron pipe, it is necessary to line the inner wall of the pipe with cement, that is, to line the inner wall of the pipe with a layer of cement. The process is to pour the mixed cement slurry into the pipe, and use the high-speed rotation of the lining machine to make the cement slurry The inside of the tube is centrifuged to form a lining. During the centrifugation process, both ends of the tube need to be blocked to prevent cement from flowing away from both ends. In order to keep the plug stuck at both ends of the pipe and not fall off, the plug is made of rubber, and there is a cavity inside that can be inflated. When it is inflated to a certain extent, the pipe will be stuck...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/134B05C11/00
Inventor 李启华
Owner 高平市泫氏铸管有限公司